Specific colored wire dedicated for the purpose is the blue one in both standards. Our particular concern is for wiring electric brakes on its side with a 7-pin plug. They use Red and Black interchangeably for 12V battery power. However, the SAE standard has a purple-colored wire instead of black. There are seven colored wires in a 7-pin connector both on the vehicle side and trailer side.Īccording to the RV standard, the colors included are white, brown, green, yellow, blue, red, and black. However, you can modify the wiring according to your requirements. How to Wire a 7 Pin Trailer Plug With Electric Brakes?Ī 7-pin connector is suitable for large trailers and RVs with more wiring options.Įach wire has specific color according to the standard for a particular function. What will be the effect of broken wire on trailer electric brakes?.How to protect wires connecting the electric brakes with a 7 Pin Trailer Plug?.Wire connection between parts of the trailer breakaway system.Connect wires with trailer breakaway system.Wiring for trailers with hydraulic brakes.Wire Connection in Tandem Axle Trailers.Electric brakes wiring for single axle trailer.How to Wire a 7 Pin Trailer Plug With Electric Brakes?.The 7 pin round Type 1 and Type 2 connectors are found in all states and territories throughout Australia. Since the introduction of the mandatory 7 pin connector, all wiring connections have been standardised and the use of a specific trailer cabling involving seven wires and standardised colouring has also been adopted. If auxiliary circuits are required, then the 12 pin Type 3 connector would be preferable.ħ pin connectors are mandatory on all new trailer units first registered after January 1, 1988, allowing sufficient connections to cope with all lighting requirements and electric brake controls. Please note that because of interchangeability problems that may arise, it is recommended that pin number 5 in the 7 pin connectors be used only for service brakes. For reference - a Type 3 connector is the flat variety and this comes in 7 pin and 12 pin. Both Type 1 and 2 plugs have a locating notch at the bottom. The larger round Type 1, 7 pin plug seems to be quite popular in Victoria. Type 1 is the large 7 pin connector type with a PCD (Pitch Centre Diameter) of 20mm, whilst Type 2 is the small 7 pin connector type with a PCD of 13mm. There is a large and small variety of this plug and socket type. More information can be found on the Australian Government's - Department of Infrastructure, Transport, Regional Development and Local Government website. This applies to all types of trailer plugs used in Australia. Also, an important thing to remember - it is the WHITE wire that is the earth in trailer wiring not the green or black wires. Knowing these colour codes can save you the time consuming exercise of testing lights by means of trial and error. The following diagrams and bullet points provide the Australian Standard for 5 and 7 pin plugs and sockets for trailers and caravans. Well, we are not going to go too in depth with all these types - only the more commonly used ones. As mentioned above, there are a number of connectors from 5 pin round, 6 pin round, 7 pin round small, 7 pin round large, 7 pin heavy duty, 7 pin flat, and even a 12 pin flat - phew!! and not to mention all the adapters available, it can all be quite confusing. Trailer wiring can be difficult to get your head around. Although there are some people who have the aptitude to test trailer, camper and caravan lights, diagnose faults, and even fix them - this article does not intend to be a replacement for an auto electrician (which is a trade), and instead should only be used as a guide. There quite a few types out there, and some types are more predominantly used depending on the state you live in. This article will provide some tips for trailer wiring, showing you the various plugs and sockets used in Australia.
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